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How to use image_size_names_choose action in WordPress

Sandeep Kumar Mishra
Sandeep Kumar Mishra
July 12, 2022
5 minutes read

image_size_names_choose action

Filters the names and labels of the default image sizes.

To use image_size_names_choose action, first you have to register it using add_action. You can write this code into functions.php of your activated theme or in a custom WordPress Plugin.

We at Flipper Code, always prefer to create a custom WordPress Plugin while using hooks so nothing breaks when you update your WordPress Theme in the future.

In the below live example, we have defined a function execute_on_image_size_names_choose_event which takes 1 parameters and we registered using add_action. The first parameter image_size_names_choose is name of the hook, The second parameter execute_on_image_size_names_choose_event is name of the function which need to be called, third parameter is the priority of calling the hook if same hook is used multiple times and the last parameter is the number of arguments (if any) to be passed in the registered function.

Sometime, you have to remove a registered hook so you can use remove_action to remove image_size_names_choose action.


    Below the 1 parameter is required to use this hook.

  • $size_names : (string[]) Array of image size labels keyed by their name. Default values include ‘Thumbnail’, ‘Medium’, ‘Large’, and ‘Full Size’.

Live Example

// Add images sizes.
function custom_theme_setup() {
    add_image_size( 'custom-size-1', 1200, 300, true );
    add_image_size( 'custom-size-2', 1000, 333, true );
add_action( 'after_setup_theme', 'custom_theme_setup' );
 // Make custom sizes selectable from WordPress admin.
function custom_image_sizes( $size_names ) {
    $new_sizes = array(

Below is an example how you can use this hook.

                        function execute_on_image_size_names_choose_event($size_names){
                           //You can write code here to be executed when this action occurs in WordPress. Use the parameters received in the function arguments & implement the required additional custom functionality according to your website requirements.
                        // add the action
                        add_action( "image_size_names_choose", "execute_on_image_size_names_choose_event" , 10, 1);

To remove a hook callback, use the example below.

remove_action( "image_size_names_choose", "execute_on_image_size_names_choose_event", 10, 1 );

Please make sure provide the same callback function name, priority and number of arguments while removing the hook callback.

Flipper Code is a Premium WordPress Plugins development company and integrating new functionalites into WordPress sites in form of custom WordPress Plugins since 2012. If you’re having any trouble using this hook, please contact our WordPress Development Team and we’d be happy to assist you.

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